Shorewall users - Oct 2004 - Adding/Dropping DNAT rules dynamically

Hi all --

I would like to set up a script that would add and drop DNAT rules while 
Shorewall is running. I don''t see a /sbin/shorewall command that would
do it.

So, it seems to me the script could edit  /etc/shorewall/rules to insert or 
remove the DNAT rules as needed, then execute a /sbin/shorewall restart 
command.

Does anyone see a reason not to do that, or see a way to do it without 
restarting shorewall?

Thanks in advance.

Jim